<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body" v-if="shopCartList.length > 0">
        <ul class="cart-list" v-for="item in shopCartList" :key="item.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" v-model="item.isChecked" :true-value="1" :false-value="0">
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl">
            <div class="item-msg">{{ item.skuName }}</div>
          </li>

          <li class="cart-list-con4">
            <span class="price" style="font-size: 16px;">{{ item.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeSkuNum(item, item.skuNum - 1)">-</a>
            <input autocomplete="off" type="text" :value="item.skuNum" @input="changeSkuNum(item, $event.target.value)"
              minnum="1" class="itxt">
            <a href="javascript:void(0)" class="plus" @click="changeSkuNum(item, item.skuNum + 1)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum" style="font-size: 17px;">{{ item.skuNum * item.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteShopcart(item.id)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>



      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllChecked" @change="handleCheck">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteisCheckedgoods">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ totalCheckedNumber }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <!-- <router-link class="sum-btn" to="/trade">结算</router-link>  -->
          <!-- 要有商品才能结算 -->
          <a class="sum-btn" href="javascript:void(0);" @click="goTrade">结算</a>

        </div>
      </div>
    </div>
  </div>
</template>

<script>


import { mapMutations, mapState } from 'vuex';

export default {
  name: 'ShopCart',


  computed: {
    ...mapState('shopCart', ['shopCartList']),
    //求总和
    totalPrice() {
      return this.shopCartList.filter(item => item.isChecked === 1).reduce((sum, item) => {
        return sum + item.skuNum * item.skuPrice
      }, 0)
    },
    //判断是否全选
    isAllChecked() {
      return this.shopCartList.every(item => item.isChecked == 1)
    },
    totalCheckedNumber() {
      //先得到过滤一个数组，再把他长度返回
      return this.shopCartList.filter(item => item.isChecked === 1).length
    }
  },
  methods: {
    ...mapMutations('shopCart', ['delShopCartItem','delIscheckedCartItem']),
    //通过全选按钮控制小按钮
    handleCheck() {
      const newCheck = this.isAllChecked ? 0 : 1
      this.shopCartList.forEach(item => {
        /*可以直接在Vue组件中修改 shopCartList里面每一项对象的isChecked的值并进行会话存储成功的原因：
        shopCartList 这个数组还是那个数组，内存地址不变。
      里面的对象还是原来的对象，只是字段变了，Vue可以追踪到，sessionStorage手动保存新数据也成功。 */
        item.isChecked = newCheck
      })
      // 每次批量修改也更新 sessionStorage
      sessionStorage.setItem('SHOPCARTLIST', JSON.stringify(this.shopCartList))
    },
    //删除某一项购物车中的商品
    deleteShopcart(delId) {
      this.delShopCartItem(delId)
    },
    //删除选中的商品
    deleteisCheckedgoods(){
      this.delIscheckedCartItem()
    },
    // 🔥 新加：数量变化时的方法
    changeSkuNum(item, newNum) {
      // 强制转换成数字
      let finalNum = Number(newNum);
      // 最小是 1
      if (finalNum < 1) finalNum = 1;
      item.skuNum = finalNum;

      // ⚡ 实时同步到 sessionStorage
      sessionStorage.setItem('SHOPCARTLIST', JSON.stringify(this.shopCartList))
    },
    goTrade(){
      if (this.totalPrice>0) {
        this.$router.push('/trade')
      }else{
        return this.$message.error('请勾选购买商品')
      }
    }
  },

  mounted() {
    console.log(this.totalPrice);

  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      &>div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        &>li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }


        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>